The price of a bottle is first increased by 15% and later the price was decreased by 24% due to reduction in sales. Find the net percentage change in the final price of the bottle. 

Correct option is B

Let the initial price be Rs. 100

Firstly, the price was increased by 15%

New Price = 15% of 100 + 100 = 15 + 100 = Rs. 115

then reduced by 24%

Final Price = 115- 24% of 115 = Rs. 87.4

Net Percentage change = $$\frac{100-87.4}{100}×100= 12.6 {\%}$$​​